From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kuninori Morimoto Subject: [PATCH 08/17] of_graph: add of_graph_get_top_port() Date: Mon, 31 Oct 2016 01:18:05 +0000 Message-ID: <87eg2xba0r.wl%kuninori.morimoto.gx@renesas.com> References: <87pomhba6r.wl%kuninori.morimoto.gx@renesas.com> Mime-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset="US-ASCII" Return-path: In-Reply-To: <87pomhba6r.wl%kuninori.morimoto.gx@renesas.com> Sender: linux-kernel-owner@vger.kernel.org To: Rob Herring , Mark Brown Cc: Linux-ALSA , Liam Girdwood , Simon , Laurent , Guennadi , Grant Likely , Frank Rowand , Linux-DT , Linux-Kernel List-Id: devicetree@vger.kernel.org From: Kuninori Morimoto driver want to get top level of port[s] node. This patch adds of_graph_get_top_port() for this purpose Signed-off-by: Kuninori Morimoto --- drivers/of/base.c | 24 ++++++++++++++++++++++++ include/linux/of_graph.h | 2 ++ 2 files changed, 26 insertions(+) diff --git a/drivers/of/base.c b/drivers/of/base.c index fed0b023..e49eb28 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -2330,6 +2330,30 @@ struct device_node *of_graph_get_port_by_id(struct device_node *parent, u32 id) EXPORT_SYMBOL(of_graph_get_port_by_id); /** + * of_graph_get_top_port() - get the top port node + * @dev: pointer to the device + * + * Return: A 'port' node pointer with refcount incremented. The caller + * has to use of_node_put() on it when done. + */ +struct device_node *of_graph_get_top_port(struct device *dev) +{ + struct device_node *np = dev->of_node; + struct device_node *node; + + node = of_get_child_by_name(np, "ports"); + if (node) + return node; + + node = of_get_child_by_name(np, "port"); + if (node) + return node; + + return NULL; +} +EXPORT_SYMBOL(of_graph_get_top_port); + +/** * of_graph_get_next_endpoint() - get next endpoint node * @parent: pointer to the parent device node * @prev: previous endpoint node, or NULL to get first diff --git a/include/linux/of_graph.h b/include/linux/of_graph.h index 80ced0c..ee823c6 100644 --- a/include/linux/of_graph.h +++ b/include/linux/of_graph.h @@ -14,6 +14,7 @@ #ifndef __LINUX_OF_GRAPH_H #define __LINUX_OF_GRAPH_H +#include #include #include @@ -44,6 +45,7 @@ struct of_endpoint { int of_graph_parse_endpoint(const struct device_node *node, struct of_endpoint *endpoint); struct device_node *of_graph_get_port_by_id(struct device_node *node, u32 id); +struct device_node *of_graph_get_top_port(struct device *dev); struct device_node *of_graph_get_next_endpoint(const struct device_node *parent, struct device_node *previous); struct device_node *of_graph_get_endpoint_by_regs( -- 1.9.1